feat: Add vectorized summary field and migration tools

- Add 'summary' field to Chunk collection (vectorized with text2vec)
- Migrate from Dynamic index to HNSW + RQ for both Chunk and Summary
- Add LLM summarizer module (utils/llm_summarizer.py)
- Add migration scripts (migrate_add_summary.py, restore_*.py)
- Add summary generation utilities and progress tracking
- Add testing and cleaning tools (outils_test_and_cleaning/)
- Add comprehensive documentation (ANALYSE_*.md, guides)
- Remove obsolete files (linear_config.py, old test files)
- Update .gitignore to exclude backups and temp files

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.gitignore

@@ -11,4 +11,11 @@ __pycache__
 
 # Node modules (if any)
 node_modules/
-package-lock.json
+package-lock.json
+
+# Backup and temporary files
+backup_migration_*/
+restoration_log.txt
+restoration_remaining_log.txt
+summary_generation_progress.json
+nul